This indoor intercom is made by AAS Aiphone. This is the master station and it runs on a single channel. It comes with it's own transformer. The intercom also has a door release button built in to the system. Items ship same day.
This keypad system also has a built-in intercom feature. It can hold 100 unique 4 digit codes plus an override code. The system runs on only 12 volts DC so it's a perfect fit for solar operators. Must use part# 39-LEM-1DL for the indoor master station.